• Which is the fiercest freshwater fish?
  The piranha, which lives in rivers in tropical Central and South ...

• How many kinds of shark are there?
  There are about 370 different species of shark living all over the ...

• What is an amphibian?
  An amphibian is a creature that lives in water and on land. ...

• What is a tadpole?
  A tadpole is the young, or larva, of an amphibian such as a frog or ...

• Why do frogs croak?
  Male frogs make their croaking calls to attract females. The frog has ...

• Which is the smallest frog?
  The smallest frog, and the smallest of all amphibians, is the Cuban ...

• How can treefrogs climb trees?
  Treefrogs are excellent climbers. On each of their long toes is a ...

• How did the spadefoot toad get its name?
  The spadefoot toad got its name from the hard spadelike projection on ...

• What is a porpoise?
  A porpoise is a small whale with a rounded head, not a beaked snout ...

• Which whale dives deepest?
  The sperm whale dives to at least 3,300 ft (1,000 meters) below the ...